Scheming girl forced prince to get marry, but he swears only marry with princess! 

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Agreed and the only reason the FIL knows is because Miaorong told him what she overheard so she could be the concubine. That Letter of Engagement fed her delusions of "What If" the princess never became his wife.

This house seems to be run by lunatics. If it's not the FIL it's the MIL doing it saying stupid stuff. Holy crap! If empress granny knew the hot mess this family is she wouldn't have allowed her beloved granddaughter to marry into that clan or at least had the couple move to the palace to avoid their drama. Where the hell does that side chick think she can overrun the princess and dictate and have a word that overrides the princess? Who got off their throne and told her to hop on? The FIL is ridding my last nerve with the things he allows..

All the guy needed to tell his father is she was poisoned saving him. That they we’re warned against sex due to the risk of her getting pregnant thus weakening her further by the poison & killing both her and the baby. Better safe than sorry. It’s not like they can’t have any sexual activity. Just not full intercourse until the poison is fully flushed from her system. That is all he has to explain. Plain simple done. The FIL then could focus on finding help to flush the poison out sooner. Seriously parents need to stay out of their adult kids bedrooms.. especially their Beds!!!

Rebirth for you

Thank you very much Skin Esteem KH I appreciate your response